Alarm clock



March 27, 192s. 1,663,710

K. KOPATSCHEK ALARM CLOCK Filed Jan. 21, 1926 Jrzverzor:

Patented Mar. 27, `1928.

UNITED STATESIt KARL KOPATSCHEK, OF BERLIN -WILMERSDORF, GERMANY.

ALARM CLOCK.

Application led January 21, 1926, Serial No. 82,836, and in Germany February 2, 1925.

carried by the hour-hand sleeve which may successively engage the releasing pins inserted in holes arranged circumferentially about the hourhand sleeve to cause a number of signals to be given at predetermined times without necessitating rewinding the spring of the alarm mechanism.

The main object of the invention is to simplify the construction of the alarm clock land to substantially improve the working.

TvVith these and other objects in view the invention consists in the construction, combination and arrangement of parts hereinafter set forth and falling Within the scope of the claims.

In the accompanying drawing the preferred form of the invention has been shown by way of example.

In said drawing- Figure l is a broken away front elevation o f an alarm clock according to the invention,

Figure 2 is a section through the releasing device with the individual parts in the locked position and Figure 3 is a section through the releasing device with the individual parts in another position. .3@

Upon the hour wheel shaft 36 ofthe usual clockwork mechanism in front of the hour wheel 37 and with the interpos'ition of a cam plate 38 toothed disc 39 rigidly connected with the latter is mounted in such a way as to usually rotate with the shaft but of being capable of rotating in the opposite direction. Above the disc 39 a bell' crank lever 40 is rigidly mounted on the hour wheel shaft 36. On the under surface of the lever 40 is slidably supported a second doubly bent lever 41 and a pin 42 provided on the under surface of the lever 40 engages in a longitudinal slot 43 in the lever 41. The leve-r 41 also has a preferably riangular slot 44, which engages over a pin 5 provided on the surface of the plate 39. With a second pin 46 on the surface of the plate 39 the free end 47 of the lever 41 can cooperate. `The end '47 is guided by a bow or stirrup 38 secured to the plate 39. The other end of the lever 41 is constructed as a releasing arm and equipped with one or more engaging teeth 49, which can cooperate with insertion pins 50. The releasing arm 41 is subject to the action of a spring 51, which is secured at 52 to the arm 40. Between the cam plate 38 and the toothed disc 39 is located a spring 54 which locks the clappe-r 53 of the alarm mechanism. On the shaft 55 driven by the alarm mechanism in the clock-wise direction are secured one or more drivers 56, for example springs, segments or india rubber friction blocks, which can cooperate with the teeth on the outer edge of the disc 39. The

spring 56 may for example be formed by a pin and be connected with its pivot by a simple helical coil. The spring 56 may, however, be formed as a curved leaf spring connected to the shaft 55 in the manner shown in Fig. 1.

The method of Working of the alarm clock according to Figs. 1-3 is briefly as follows:

The rotation of the hour Wheel shaft 36 is shared by the cam plate 38, the toothed disc 39 and the lever 40 and consequently by the releasing arm or lever 41, the tee-th 49 of which owing to the action of the spring 51 are located in the path of the stationary plug holes 57. Now if a pin 50 has been insert-ed 1n any one of the holes 57 and the releasing arm 41 strikes against the pin 50 with its tooth 49, which is located in front having regard to the direction of rotation, its opposite end 47 is oscillated about the pin 42 towards the centre of the mechanism, the end 47 striking against the pin 46 and consequently rotating the plate 39 in a counter clock-Wise direction. The consequence of this is that the downwardly inclined surface 60 of the extending cam of the cam plate 38 connected with the plate 39 abuts against the spokes 61 of the wheel 37, so that, on further rotation of the disc 38 with regard to the wheel 37, the disc 38 is raised. By this means the spring 54 which rests upon the disc 38 and which locks the clapper arm 53 is also raised, so that the signal is now given. Consequently the shaft 55 now rotates in a clock-Wise direction and the driver 56 comes into contact with the teeth on the disc 39 and rotates the latter further in the countercloek-Wise direction. Under' these circumstances the pin 45 comes to lie against the edge of the slot 44 and, after the signal has now beengiven for a few seconds, pulls the arm 41 quickly out of the path of theplug 50. During the engagement of the driver 56 .with the plate 39 the signal continues. to sound until the driver 56 Comes out of engagement with the plate 39 and itself `comes to rest. So long as the driver 5,6 remains in engagement With thev teeth of the plate 39 the releasing arin 41 remains outside the path of the pins 50, but is oseillated about the pivot 42 by the stressed spring 51. At the instant at which theA driver 56 during its urtherprotation comes out of engagement with the teeth of the plate 39 the pulling out of the lever 41 is terminated and the stressed spring 51 can nov7 slide the rocked4 lever 41 toward the insertion holes 57 so that now the second tooth 49 comes into engagement with the same pin 50 and a second .signal is given in the same manner.` Under the action of the spring 51v the disc 39 is rapidly rotated back by the slot 44 and the pin 45 simultaneously, the

- cams 60 on the cam plate 38 again coming to lie between the spokes 61 of the hour Wheel 37, and the spring 54 consequently being brought into the path of the clapper 53, the signalling therefore being interrupted.

If the releasing arm 41 has more than one tooth 49 a number of signals corresponding to the number of these teeth are given at short intervals of time.

It is understood that my inventionis not limited to the specific embodiment shown and that various deviations may be made Without departing from the spirit and scope of the appended claims.

What I claim as new and desire to secure\ by Letters Patent is:

1. An alarm clock comprising an alarm mechanism and a spindle carrying an hour hand, a T-shaped arm secured to said spindle, a double bent lever pivotally and shiftably connected to the head of said T-shaped arm by a pin and slot connection, a toothed Wheel rotatably mounted on said spindle, means provided at the surface of said Wheel engaging with the free end of the double bent lever and a triangular hole in the bend of said lever, a spring connected to the T- shaped head of said arm and acting upon the adjacent end of the double bent lever, a pin adapted to be positioned in the path of said double bent lever to cause the same to impart a movement of rotation to said toothed Wheel and thereby releasing the alarm, and a resilient driver actuated by the alarm mechanism and cooperating with the teeth of said WheelI for stopping the alarm after a predetermined period of operation and for moving the double bent lever out ot engagement with the pin a few seconds after the signal begins to ring and for at once bringing said double bent lever again in a position ready for giving another signal.

2. An alarm clock comprising an alarm mechanism and a spindle carrying an hour hand, a T-shaped arm secured to said spindie,- a double bent lever pivotally and shiftably connected to the head of said T-shaped arm by a pin and s lot'connection, a toothed Wheel rotatably mounted on said spindle, pins provided at the surface of said Wheel engaging With the free end of the double bent lever and a triangular hole in the bend of said lever, a spring connected to the T- shaped head oitI said arm and acting upon the adjacent end of thedouble bent lever, a pin adapted' to be positioned in vthe path of said double bent lever, teeth at the free end of said double bent lever adapted to engage successively said pin to cause the said bent lever to impart a movement of rotation to said toothed Wheel each time one of the said teeth strikes the said pin and thereby to release a number of alarms corresponding to the number of teeth, and a. resilient driver actuated by the alarm mechanism vand cooperating with the teeth of said Wheel for stopping the alarm after a predetermined period of operation and for moving the double bent lever out of engagement with the pin a few seconds after the signal begins to ring and for at once bringing said double bent lever again in a position ready for giving another signal.V Y

3. An alarm clock" comprising an alarm mechanism and aspindle carrying an hour hand, a T-shaped arm secured to said spindie. a second double bent arm pivotally and shiftably connected to the rear ace of the head of said T-shaped arm by a pin and slot connection, a toothed Wheel rotatably mounted on said spindle, pins provided at the surface of said Wheel engaging with the free end of the double bent arm and triangular hole in the bend of said arm, a spring connected to the T-shaped head of said lever and the adjacent end of the double bent lever, and a pin adapted to be positioned in the path of said double bent lever to cause the same to impart a movement of rotation to said toothed Wheel.

In testimony whereof I afiX my signature.

KARL KOPATSCHEK. 

